SIZE-3/0 UNI-THREAD is what I use to tye F-C Sand Shrimps and other saltwater & bass flys. It's fine diameter and strong. Wraps flat. Strong enough to spin deer-hair, or tye wool-head sculpins. Pre-waxed 100-yd spools. COLORS: (1)Black, (2)Brown, (3)Dk-Brown, (4)Fl-Chartreuse, (5)Green, (6)Gray, (7)Lt-Cahill, (8)Olive, (9)Orange, (10)Pink, (11)Red, (12)Tan, (13)White, (14)Wine, (15)Yellow, (16)Iron-Gray, (17)Lt-Blue, (18)Rusty-Brown, (19)Olive-Dun